Device for collecting residual liquid in casing pipe

Abstract

The utility model discloses a device for collecting residual liquid in a casing pipe, and belongs to the technical field of offshore well drilling and workover. The device for collecting the residual liquid in the casing pipe comprises a casing pipe sealing piece, and a compressed air input device and a liquid discharging device which penetrate through the casing pipe sealing piece are arranged above the casing pipe sealing piece. And an extension pipeline is arranged below the sleeve sealing piece and is communicated with a compressed air input device. According to the utility model, the residual liquid above the cutting depth in the sleeve is collected through the liquid discharging device by using compressed air, so that the purpose of efficiently recovering the residual liquid in the sleeve can be achieved, and the influence of the residual liquid on operation is reduced. The device is suitable for recovering residual liquid in the casing pipe before the casing pipe is cut in the offshore drilling and workover operation, is particularly suitable for collecting oil-based / synthetic-based mud, and is also suitable for collecting water-based mud or other liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore drilling and well completion, in particular to a device for collecting residual liquid in a casing for an offshore platform. Background Art

[0002] At present, at the oil development site of an offshore modular drilling rig, after the casing cementing is completed and before the casing is cut, the residual liquid in the casing, especially the oil-based mud, brings a series of problems to the operation: without discharging the residual liquid, the cutting time of the casing will be too long due to the existence of the residual liquid inside the casing; as the cutting progresses, the residual liquid will gradually be discharged onto the operation deck, bringing great potential hazards, huge risks and challenges to the on-site operation safety and marine environmental protection, and cleaning the residual liquid will waste a large amount of manpower and material resources. Content of the Utility Model

[0003] The utility model provides a device for collecting residual liquid in a casing in order to solve the above technical problems.

[0004] The utility model is realized by the following technical solutions.

[0005] A device for collecting residual liquid in a casing includes a casing closure. Above the casing closure, there is a compressed air input device and a liquid discharge device penetrating through the casing closure; below the casing closure, there is an extension pipeline, and the extension pipeline is communicated with the compressed air input device.

[0006] Further, the compressed air input device is a tubular structure with a certain wall thickness and connected to a compressed air pipeline.

[0007] Further, the liquid discharge device is a tubular structure with a certain wall thickness and connected to a platform residual liquid recovery device.

[0008] Further, the bottom depth of the extension pipeline is lower than the casing cutting depth.

[0009] Further, the lower part of the casing closure is provided with a thread having the same thread type as the cut casing.

[0010] Further, the casing closure includes a top plate, and the edge of the top plate extends downward to form a side wall.

[0011] The utility model has obtained the following beneficial effects.

[0012] (1) The utility model can solve a series of problems brought by the residual liquid in the casing, especially the oil-based mud, at the oil development site of an offshore modular drilling rig after the casing cementing is completed and before the casing is cut;

[0013] (2) The compressed air input device in the present utility model is connected to the platform compressed air to provide a power source; the liquid discharge device can discharge the residual liquid in the casing.

[0014] (3) The thread of the lower part of the casing seal in the present utility model has the same thread type as the cut casing, which can ensure effective sealing between the device and the casing, and helps to recover as much as possible the residual liquid inside the casing under the action of compressed air.

[0015] (4) The extension pipeline in the present utility model can be adjusted in length as needed to ensure that the compressed air can recover as much as possible the residual liquid above the cutting depth of the casing. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a diagram of the usage state of the present utility model.

[0018] Among them: 1. Compressed air input device, 2. Liquid discharge device, 3. Casing seal, 4. Thread, 5. Extension pipeline, 6. Casing. Detailed Embodiments

[0019] Next, the technical solution of the present utility model will be clearly and completely described through specific embodiments.

[0020] As Figure 1-2 shown, a device for collecting residual liquid in a casing includes a compressed air input device 1, a liquid discharge device 2, a casing seal 3, and an extension pipeline 5.

[0021] The outer side of the casing seal 3 is connected to the compressed air input device 1 and the liquid discharge device 2, the inner side of the casing seal 3 is connected to the extension pipeline 5, and the extension pipeline 5 is connected to the compressed air input device 1. The thread 4 at the lower part of the casing seal 3 is connected to the casing 6.

[0022] Specifically, the compressed air input device 1 is a tubular structure with a certain wall thickness that can be connected to the compressed air pipeline, and the platform compressed air provides a power source for discharging the residual liquid in the casing 6.

[0023] The liquid discharge device 2 is a tubular structure with a certain wall thickness that is connected to the platform residual liquid recovery device, and the liquid discharge device 2 can discharge the residual liquid in the casing 6.

[0024] The casing closure 3 includes a top plate, the edge of the top plate extends downward to form a side wall, and a thread 4 is formed at the lower part of the side wall. The thread 4 has the same thread type as the cut casing, which can ensure effective sealing between the device and the casing 6, and helps to recover as much as possible the residual liquid inside the casing 6 under the action of compressed air.

[0025] The extension pipeline 5 is selected as a flexible hose, and its length can be determined according to the cutting depth of the casing. The bottom depth (the depth of the bottom end) of the extension pipeline 5 is lower than the cutting depth of the casing, so as to ensure that the compressed air can recover as much as possible the residual liquid above the cutting depth of the casing.

[0026] The construction method of the present utility model is as follows:

[0027] Connect the thread 4 at the lower part of the casing closure 3 to the casing 6, connect the platform compressed air to the compressed air input device 1, connect the liquid discharge device 2 to the platform residual liquid recovery device, and the bottom depth of the extension pipeline 5 is lower than the cutting depth of the casing. After connecting in the above manner, turn on the platform compressed air. The compressed air enters the casing 6 through the compressed air input device 1 and the extension pipeline 5, and uses the compressed air to collect the residual liquid above the cutting depth in the casing 6 through the liquid discharge device 2. In this way, the purpose of efficiently recovering the residual liquid inside the casing can be achieved, and the influence of the residual liquid on the operation can be reduced.

[0028] The above-described embodiments are only used to describe the preferred embodiments of the present utility model, and do not limit the concept and scope of the present utility model. Without departing from the design concept of the present utility model, various modifications and improvements made by ordinary engineering and technical personnel in the field to the technical solution of the present utility model shall fall within the protection scope of the present utility model. The technical content claimed by the present utility model has been fully recorded in the claims.

Claims

1. A device for collecting residual liquid in a casing, characterized in that: The invention comprises a sleeve closure (3), wherein a compressed air input device (1) and a liquid discharge device (2) penetrating the sleeve closure (3) are arranged above the sleeve closure (3); an extension pipeline (5) is arranged below the sleeve closure (3), and the extension pipeline (5) is connected to the compressed air input device (1).

2. A residual liquid collection device in a casing according to claim 1, characterized in that: The compressed air input device (1) is a tubular structure with a certain wall thickness and connected to a compressed air pipeline.

3. The residual liquid collection device in a casing according to claim 1, characterized in that: The liquid discharge device (2) is a tubular structure with a certain wall thickness and connected to the platform residual liquid recovery device.

4. The residual liquid collection device in a casing according to claim 1, characterized in that: The bottom depth of the extension pipeline (5) is lower than the casing cutting depth.

5. The residual liquid collection device in a casing according to claim 1, characterized in that: The lower part of the casing closure (3) is provided with a thread (4) of the same thread type as the cut casing.

6. The residual liquid collection device in a casing according to claim 1, characterized in that: The sleeve closure (3) comprises a top plate, the edge of which extends downward to form a side wall.

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